This is something that our Product Development team will consider for future version of the software. In the future, we want to offer more options to our users: The user should be able to import a grid geoid file into Pix4Dmapper that will define the geoid altitudes for his/her area. Flights for site A (gravel stockpile) were at an altitude of 130 to 150 m above ground, achieving a ground sample distance (GSD) of 5 cm. This does not work perfectly (as the curvature and scale issues will not be taken into account) but it is a good approximation (especially for small areas).
#PIX4DMAPPER GCP ELEVATION SOFTWARE#
The software will give you the results in NAV88 (interpolating). In order to do this, the Import GCPs tool from the Manage GCPs menu was selected.
This orthomosaic does not have the GCPs marked in as is required. So, indeed, if you add your GCPs with NAV88 altitudes, you can set the altitude as Arbitrary: The folder connection of the data processed in Pix4D was added, and the orthomosaic was added in. From the course: Learning Pix4D Drone Mapping.
#PIX4DMAPPER GCP ELEVATION HOW TO#
If the geoid varies a lot (not a constant difference), then the only solution is to have GCPs with the desired altitudes (in your case NAV88 altitudes). In this video, learn how to use the GCP/MTP Manager for the purpose of correlating the imported GCP to the. Process post-flight images easily on the cloud or desktop applications, producing georeferenced maps and models that are tailored to many industry needs. Also, Pix4Dmapper has the ability to generate point cloud with a precision of 5-20 cm due to its GCP function, and it also contains built-in function to calculate the length, area and volume of. (You need to know the difference between the NAV88 and a known ellipsoid - the one related to your horizontal coordinate system) A free companion to Pix4D photogrammetry software, Pix4Dcapture is the perfect tool to automatically capture image data - RGB, thermal - for optimal 3D models and maps. It represents the vertical coordinate system / Geoid Height Above the used ellipsoid that will be used to convert the GCPs height from geoid to ellipsoidal. I copy here the most important information:Ĭurrently Pix4Dmapper can do some altitude conversions for known geoids (egm84, egm96, egm2008)įor other geoids, we can only apply 1 constant difference (Geoid Height Above a known ellispoid):
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